Building a Lab for the Sample App

There are a few prerequisites that need taking care of before deploying the app:

• Swarm mode: We’ll deploy the app as a Docker Stack, and stacks require Swarm mode.
• Labels: One of the Swarm worker nodes needs a custom node label.
• Secrets: The app uses secrets that need pre-creating before it can be deployed.

Sample app

We’ll build a three-node Linux-based Swarm cluster that satisfies all of the application’s prereqs. Once we’re done, the lab will look like this.